Co2 leak.. I've done everything to find it!!!

For a few months I've had a bad leak in my kegerator. I have three kegs and a 5LB tank. For a while I wasn't too aggressive in my search. Lately I have been and have been unable to track it down. I've replaced all the o-rings, lubed them up, cranked up the pressure and sprayed them down to find the bubbles. NOTHING!! Yet, if I shut off the gas overnight and turn it on the next day, all my kegs refill. Why would all of them be losing an equal amount of pressure? Could the one leaky keg cause the others to leak? Could my manifold be the culprit? I've already replaced my regulator. I'm lost and losing money on filling the tank almost weekly..

If there are no anti-backflow-valves (aka check valves) on the gas lines to the kegs, then their head spaces are essentially common, so any leak in the system will affect all of the kegs.

Something to try tonight that won't cost a whole bottle of gas: charge up all of your kegs with gas, then remove the gas QDs from all of the kegs, and turn off the gas supply. Tomorrow, turn on the gas supply, and connect one gas QD to one keg. If you hear a prolonged flow of gas, that's a leaky keg. If not, disconnect the QD and try the next keg, and so on.

Detecting a bad O-ring on a gas post is probably one of the toughest things to do, short of submerging the keg top under water with the gas connected (one way to do this with an upright keg is to wrap duct tape around the top of the keg to create a pool that you can flood with water while the gas is connected and turned on). You might consider just replacing all of the gas post O-rings outright, dab each with keg lube, and see if the problem resolves...

Cheers!

I FOUND IT!

Last night after posting, I couldn't sit still so I went to work and tore everything apart. found the leak at one of the pepcock valves. They appear to be two pieces. Where the two pieces meet, there was a leak at that point. I'm not sure how I didn't find it before... Think i'm all set now. GOing to go get a new valve tomorrow. Hopefully that will fix it for good.